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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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Chapter
Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

In addition to a low P o 2 , the peripheral chemoreceptors are also sensitive to a/an

1. Decreased H +

2. Increased P co 2

3. Decreased pH

4. Increased temperature

A. 2 only

B. 3 only

C. 1,2, and 3 only

D. 2,3, and 4 only

Summary Introduction

Introduction:

The peripheral chemoreceptors are oxygen sensitive cells that respond to the decreased levels of oxygen in the arterial blood. There are some other factors, apart from oxygen levels, which facilitate the stimulation of peripheral chemoreceptors.

Explanation

Justification for the correct answer:

Option (d) is given as “2, 3, and 4 only.” The peripheral chemoreceptors are stimulated when the PaCO2 levels are increased, however, the response is minor. These chemoreceptors are directly stimulated by carbon dioxide molecules. These are also stimulated by decreased pH, which plays an important role as the change in arterial hydrogen ion concentration takes place by a change in levels of oxygen. The peripheral chemoreceptors are also activated by increased temperature. Hence, option (d) is the correct answer.

Justification for the incorrect answers:

Option (a) is given as “2 only.” The increased PaCO2 is not the only factor that can stimulate the chemoreceptors

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